Various common problems in the maintenance of screw air compressor
1. What are the maintenance methods for the screw-type air compressor "target=_blank> machine motor?
The environment of the motor should be kept dry frequently, the surface should be kept clean, and the air inlet should not accumulate dust, fibers and other debris. When the thermal protection and short-circuit protection of the motor continuously occur, check whether the fault is from the motor or overload, or because the protection device is set too low, and the fault can be cleared before it can be put into operation.
When the motor bearing is running for 1500~2000h, the grease should be added. The bearing temperature should not exceed 120°C. When the temperature is lower than 70°C, the interval of adding grease can be extended. When filling the oil, use the grease gun. First remove the grease from the drain pipe and add new grease until the original grease is drained from the drain hole. Wipe it with a rag. After the oil is filled, tighten the oil plug.
2. Explain the daily maintenance and operation record of the screw air compressor
The daily maintenance and maintenance records of the screw air compressor can be recorded periodically or irregularly, or recorded after maintenance and repair. Accurate recording is beneficial to timely analysis and troubleshooting when the air compressor fails. The main contents of the maintenance record are inspection, cleaning, adjustment, replenishment, replacement and corresponding time.
3. What is the significance of screw air compressor maintenance?
The air compressor is adequately maintained to have the best working condition. Proper maintenance increases the life of the entire machine and greatly reduces downtime. The maintenance cycle of the screw air compressor provides the reference time for the customers. If the air compressor is installed in a clean and low temperature environment, the service period can be extended appropriately. The correct service period should be determined according to the air compressor environment. .
4. What are the daily maintenance items of the screw air compressor?
Daily maintenance items specifically include:
Check the coolant level and add it in time;
Replace the coolant;
Clean or replace the air filter;
Cleaning the cooler;
Clean oil cooler
Cleaning water separator;
Replace the oil filter;
Replace the oil separator filter;
Check the hose and all fittings for leaks and find that the leaks are eliminated in time;
Belt tightness check;
Check all wire connections and pre-tighten them;
Check the AC contactor contacts;
Clean the surface of the motor suction opening and the surface of the housing;
The main motor is greased;
Clean the motor and fan motor.
5. Why does the air compressor have to be switched regularly?
When multiple air compressors are operated in parallel, they must be switched regularly. For the working environment humid air compressor, the switching operation is beneficial to discharge the water in the lubricating oil; if the air compressor is stopped for a long time (such as one month left), the adhesive particles on the oil filter or the oil separator filter element will occur. Drying, clogging the filter hole of the oil filter or the oil separator filter fiber, shortening the service life of the filter; the upper part of the air compressor rotor is not immersed in lubricating oil, and the machine is shut down for a long time, so that the rotor is in contact with humid air and rusting; The time stop will also cause oil deposits in the air compressor pipe or the main engine, which will force the air compressor to be overhauled.
6. What are the maintenance items after the screw air compressor is put into operation?
Maintenance items after 300h~500h after the new machine is put into operation: oil change and oil change filter, air filter cleaning, check for leaks, looseness, oil storage tank discharge, mobile body cleaning, belt tightness inspection and transmission inspection, motor temperature L, current, host sound check.
Maintenance items after 2000h after the new machine is put into operation: check for leaks and looseness, oil storage tank discharge, clean body, oil separator pressure difference, radiator cleaning, manual check safety valve (pull rod), belt tightness and transmission inspection, Motor temperature rise, current, host sound check.
Every 6 months or 4000h maintenance items: oil change and oil change filter, air filter cleaning, oil separator filter (or pressure difference over 0.08MPa), check for leaks and looseness, oil storage tank discharge, motor body cleaning, Oil and gas separation pressure difference, radiator cleaning, manual inspection of safety valve (pull rod), motor, cooling fan bearing for lubricating oil, electrical insulation, contact condition inspection, motor temperature rise, current, host sound inspection.
Every 12 months or 8000h maintenance items: oil change and oil change filter, air filter cleaning, oil separator filter (or pressure difference over 0.08MPa), check for leaks and looseness, oil storage tank discharge, motor body cleaning, Oil and gas separation pressure difference, radiator cleaning, motor, cooling fan bearing for lubricating oil, electrical insulation, contact condition inspection, safety protection device inspection, circulation system, control system aging inspection, safety valve, pressure gauge to get the national production department Inspection or replacement, pressure controller, solenoid valve, minimum pressure valve, temperature controller, intake valve, transmission inspection or replacement, electrical main gate inspection, motor temperature rise, current, host sound inspection, safety device reliability .
The above maintenance items should be strictly implemented by the users. The maintenance time is different for each brand air compressor. The most reasonable maintenance time is also determined by the user according to the air compressor operating status.
7. What is the maintenance method for the air filter of the screw air compressor?
The air filter is equipped with a differential pressure switch. When the differential pressure switch is operated when the differential pressure switch setting value is reached, or the internal fixed time is zero, the liquid crystal display is blocked, indicating that the air filter must be cleaned or replaced. Maintenance should be carried out after the air compressor is shut down and the corresponding safety measures are taken, as follows:
Open the end cap.
Loosen the air filter fixing bolt and take out the filter element.
Check the air filter blockage, use compressed air to purge the ash from the inside out, pay attention to the compressed air pressure does not exceed 0.3MPa.
When the air filter element is damaged, it should be replaced. Check whether the air filter element is damaged. Use the electric lamp to place it in the air filter element and observe whether there is light exposed outside.
A new air filter should be replaced when the filter element is contaminated with oil.
Cover the end cap after cleaning or replacing the filter element.
Check that the differential pressure switch equipped with the air filter is normal, and the preset value does not exceed 50 kPa.
8. What is the maintenance method for the screw air compressor oil filter?
Whether the oil filter needs to be replaced can be judged by whether the oil filter differential pressure switch is operated or the oil filter timer time is zero. After the first movement of the new machine for 500 hours, the oil intake is insufficient, causing the exhaust gas temperature to be high. Jumping, and the lack of oil will affect the bearing life. Maintenance should be carried out after the air compressor is shut down and the corresponding safety measures are taken, as follows:
Unscrew the old filter with a pliers.
Clean the contact surface.
Apply a thin film of oil to the surface of the new filter seal.
Close the new filter with your hand until the gasket is sealed; pay special attention to the new filter. Do not borrow other tools when it is tight to prevent it from being removed when the next replacement.
Check that the differential pressure switch equipped with the oil filter is installed properly and the preset value is 150 kPa.
9. What is the maintenance method for the oil separator of the screw air compressor?
Maintenance should be carried out after the air compressor has been shut down and the corresponding safety measures have been taken. Small air compressors mostly use rotary oil separator filter, the maintenance method is the same as the oil filter; the built-in steps are as follows:
Loosen the pipe on the oil drum and remove the pipe from the pressure maintenance valve (minimum pressure valve) to the aftercooler, remember to ensure proper reloading.
Loosen and remove the return line.
Loosen the fastening bolts on the top cover of the oil and gas tank and remove the oil cover.
Take out the oil separator filter and replace the new oil separator filter and gasket.
Gather back in the opposite step and tighten the bolt with a torque wrench.
After the machine is turned on, retighten the oil drum cover bolts.
Check that the differential pressure switch equipped with the oil separator filter on the oil and gas tank is installed normally. The preset value is 100 kPa.
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